/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook.presto.bytecode.control;

import java.util.Objects;
import com.facebook.presto.bytecode.BytecodeNode;
import com.facebook.presto.bytecode.instruction.LabelNode;

import static java.util.Objects.requireNonNull;

public class CaseStatement
    implements Comparable<CaseStatement> {
    private final int key;
    private final BytecodeNode body;
    private final LabelNode label;

    CaseStatement(int key, BytecodeNode body, LabelNode label) {
        this.key = key;
        this.body = requireNonNull(body, "body is null");
        this.label = requireNonNull(label, "label is null");
    }

    public int getKey() {
        return key;
    }

    public BytecodeNode getBody() {
        return body;
    }

    public LabelNode getLabel() {
        return label;
    }

    @Override
    public int compareTo(CaseStatement o) {
        return Integer.compare(key, o.key);
    }

    @Override
    public int hashCode() {
        return key;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        CaseStatement other = (CaseStatement)obj;
        return Objects.equals(this.key, other.key);
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "{key=" + key + '}';
    }
}
